Expansion drill and reamer.



No. 675,465. Patented June 4, IN. W: SHANNON. EXPANSION DRILL AND REAIIER.

. (Application filed lab. 26, 1900.) (No Model.)

UNlTED STATES PATENT OEEIcE.

WILLIAM CHANNON, OF DES MOINES, IOVA.

EXPANSION DRILL AND REAM ER.

SPECIFICATION forming part of Letters Patent N 0. 675,465, dated June 4, 1901. Application filed February 26, 1900. Serial No. 6,556. (No model.)

To aZZ 2072 0111. it TIT/[71]] concern.-

Be it known that I, WILLIAM OHANNON, a citizen of the United States, residing at Des Moines, in the county of Polk and State of Iowa, have invented certain new and useful Improvements in Expansion Drills and Reamers, of which the following is a specification.

The object of this invention is to provide an expansion drill and reamer of simple, strong, durable, and inexpensive construction, designed to be detachably connected with the end of an ordinary drill-rod and by means of which an opening of uniform size may be drilled into a coal-bank or thelike to a distance desired, and then the drillrod maybe removed and one or both of the cutting-blades released, so that when the drill-rod is again placed in the opening and the said cutting-blades reach the end of the opening previously made they will automatically expand and out an opening of much greater width, thereby adapting it to serve as a chamber in which powder or other explosive may be used to thereby increase the effective force of the explosive to be used.

My invention consists in certain details in the construction, arrangement, and-combination of the various parts of the expansion drill and reamer, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawings, in whioh- Figure 1 shows in elevation the complete expansion drill and reamer attached to the end of an ordinary drill-rod. Fig. 2 shows an elevation of the body portion of my drill and reamer, taken from the side opposite from that illustrated in Fig. l and omitting the drill-rod and also the detachable drill-point. Fig. 3 shows a plan of one of the detachable cutting-blades. Fig. at shows a plan of the end of the drill-rod.

Referring to the accompanying drawings, I have used the reference-numeral 10 to indicate the body portion of my improved drill and reamer. Near the forward end of this body portion is a spiral groove 11. At the forward end portion of the part 10 is a drillpoint 12. In the central portion of the body 10 is a slot or opening extending entirely through the part 10, said opening being provided for the purpose of admitting the cutshown in Fig. 3, comprise a fiat block 18, having a central opening 14 therein, a notch 15 at the rear end of the block, and a cuttingblade 16, projecting forwardly from the block and having its inner forward end beveled at 17 to form a point at its outer corner at 18. These cutters are placed in the opening in the part 10, with one of the cutting-blades on each side thereof, and a bolt 19 is passed through the part 10 to hold said devices securely in position and atthe same time permit them to move pivot-ally upon the said bolt. The sides of the part 10 are flattened at 20, and on these flattened surfaces the detents 21 are pivoted by means of the screws 22.

The forward ends of these detents are designed to enter the notches 15 of the cutting devices. It is obvious that when the said detents are in position in the notches the forward ends of the cutting-blades cannot move outwardly, and hence a hole of uniform size will be made by the drill. It is obvious that on account of the beveled inner corner of the forward ends of the cutting-blades the said cutting-blades when in use will have a tendency to move outward from the center of the drill, thereby forcing the rear ends of the cutting-blades into engagement with the detents 21. Hence the detents will be firmly held in position. Itis obvious, further, that when the detents are Withdrawn from the notches 15 the drill will enter the opening made previously by it, and when the cutting-blades engage the shoulder at the end of the opening the points 18 will tend to move outwardly, and hence cut a considerably" larger opening, until the cutting-blades are stopped in their outward movement by the blocks 13, thereby engaging the ends of the opening in which they are mounted in the part 10. By this means itis obvious that the cutting-blades may be locked by means of the detents 21 in a position substantially parallel with the drill, and, further, they are also looked when at the outer limit of their movementby means of the shoulders on the blocks of the cutting-blades engaging the body portion of the drill. In other words, two different means are provided for holding the out ting-blades when at the two limits of their movement.

ting-blades. These cutting-blades, as clearly I have provided means for connecting this ting-points 18.

device with the end of an ordinary drill-rod, as follows: The rear end portion of the part 10 is provided with a central longitudinallyextending slot, which slot is intersected by a set-screw 23. The forward end portion of the drill-rod 24 is flattened at 25 to enter this slot, and the tip of the drill-rod is bifurcated and the points bent outwardly at 26 to overlap the sides of part 10. An opening is provided in the flattened portion 25 to admit the set-screw 23.

It is obvious that any ordinary drill may be readily and quickly changed, so as to be capable of use in connection with my improved expansion drill and reamer.

In practical use and assuming that the devices were arranged as shown in Fig. 1, it is obvious that by turning the drill-rod 2t the drill-point 12 will first form a small opening in the coal, and the particles of coal loosened by the drill-point will be passed rearwardly by said drill to a point in the rear of the out- These cutting-points will enlarge the hole, and the coal released thereby will be forced rearwardly, by means of the groovel'l and the drill-rod 24, through the ment with the cutting-blades, whereupon the drill-rod is again placed into the same hole, and when the cutting-points 18 engage the shoulder at the end of the hole they will, as be fore stated, cut outwardly and form a larger hole at its inner end, thereby providing a chamber into which explosives may be placed, which explosives will act with greater force on the surrounding coal when thus confined. It is obvious, further, that the cutting-blades may be made of highly-tempered steel, so that they will not become dulled as readily as the ordinary dril1rod. Furthermore, when it is desired to sharpen the said cutting-blades the drill-rod is removed from the opening and the cutting-blades detached by simply removing the bolt 19,whereu pon new cuttin g-blades may be substituted in place of the old ones, or the old ones may be easily and conveniently carried to the place where they are to be sharp-- en'ecl. I

is obvious, further, that by means of the construction shown the drill and reamer may be attached to the end of an ordinary drillrod and the tool used advantageously in drilling a hole of uniform diameter.- This device may be removed and thelocking-detent released, whereupon the same device will pass through the same hole to its end before beginning to cut a hole of larger diameter, and when it does reach the end of the hole it will automatically open and cut alarger hole when rotated.

I am aware that reamers have been provided heretofore that may be set to enlarge the inner end of a hole without cutting out the hole throughout'its entire length; but I am not aware that heretofore a reamer could be passed to the inner end of a hole and there automatically adjust itself to enlarge the hole when rotated.

Having thus described my invention, what I claim, and desire to secure by Letters Patent therefor, is-

1. An improved expansion drill and reamer, comprising in combination, a body portion, a drill-point at the forward end of the body portion, cutting-blades pivoted to the body portion and having their forward ends beveled inwardly and rearwardly, whereby the cutting-blades tend to expand when rotated and advanced through coal or the like, means for locking the cutting-blades in a position parallel with the drill-point, and means for restricting the outward movement of the drillpoints, substantially as, and for the purposes stated.

2. An improved expansible drill and reamer, comprising a body portion designed to be secured to the end of a drill-rod, a drill-point connected with the body portion, one or more cutting-blades pivoted to the body portion to normally lie in planes approximately parallel with the drill-point, and having their ends beveled inwardly and rearwardly, pivoted detents capable of engaging each cutting-blade and looking it in its said position, and a shoulder on each blade to engage a portion of the body to limit the expansive movement of the blade, for the purposes stated.

WILLIAM CIIANNON.

\Vitnesses:

BONNIE K. ORWIG, J. RALPH ORWIG. 

